Battleflight Eagle

The five mana you pay buys the trigger, not the bird that delivers it. The body is a delivery mechanism: a forgettable flier exists only to carry a one-turn burst that hands any creature +2/+2 and wings until end of turn. That swing does its best work in a clogged board, where a fatty stranded behind a wall of blockers suddenly clears the ground entirely and connects in the air. It is a finisher wearing a creature's clothes. The design belongs to a recurring common-rarity pattern: bolt a combat-warping effect onto a body whose printed stats almost stop mattering, so the spell's value lives in the enters-the-battlefield clause rather than what stays behind. Both halves of the buff fire together with no choice involved, which is the whole point: you are not modulating a pump or a flying grant separately, you are buying the package and accepting the small creature as the rounding error that came stapled to it. What resolves is a modest flier; what wins games is the burst it brought along.